Stamp-mill stamp-head.



PATENTED MARJQ, 190v.-

M. P. BOSS. STAMP MILL STAMP HEAD.

Wi I masses- THl; mmm PETERS co Wu H M770 0 c 5 lower guide G of themill-frame.

MARTIN P. BOSS, OF SAN FRANCISCO, CALIFORNIA.

STAMP-MILL STAMP-HEAD.

Specification of Letters Patent.

Patented March 19, 1907.

Application filed January 12, 1905. Serial No. 240,716.

[0 heads used in stamp-mills and it consists in certain improvementstherein which have for their object the practical prolongation of theupper portion of the stamp-head in or der to extend well beyond theantisplashing housing of the mortar-cover without interfering with theadvantageously proximate lower stem-guide.

Referring to the accompanying drawings, the figure is an elevation,partly in section,

of my stamp-head, showing its improvements in direct relation to theirobjects.

A is the stamp-head having the shoe B, which is fitted in suitablemanner, as by the taper neck I), driven in a corresponding socket a.

C is a mortar in which is a die D. E is the mortar-cover. In this is acentral sleeve 6, which forms a housing in which the stamp-head playsand whose function is to prevent splashing, as I have described in aprevious application, Serial No. 171,341, filed August 31, 1903.

To the upper end of the stamp-head is fitted the stem F, which playsthrough the It is of advantage to have this guide as low as possibleconsistently with the stroke of the stamp. It

is obvious that where an antisplashing housing, such as e, is used inwhich the head itself plays vertically it is advantageous to have thishousing of suflicient length to avoid the tendency of the material topass through it in splashing, and as the stamp-head itself conduces tothis end it is necessary that said head be long enough to extend at alltimes well above the housing, but such length is inconsistent with a lowguide G. My present improvement in the stamp-head relates to thesolution of this diificulty and consists in prolonging the upper end ofthe stamphead by an annular flange M, which serves to properly lengthenthe head, to keep it well above the housing a, and at the same time toavoid contact with the low guide G by overlapping or embracing it whenat the extremity of its upward stroke.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In combination with a mortar, having a cover with an antisplashinghousing, and a fixed guide above, a stamp-stem fitted in said guide, anda stamp-head fitted to the stem, and playing through the coverhousing',said stamp-head having an annular flange prolonging its upper end andadapted to pass over the fixed guide when the stamphead is lifted.

In witness whereof I have hereunto set my hand.

MARTIN P. BOSS. Witnesses:

J. COMPTON, D. B. RIoHAR-ns.

